Booklouse (or Psocid)

Scientific Name: Liposcelis spp. (Common genus visible in households)

Order & Family: Order: Psocodea (formerly Psocoptera), Family: Liposcelididae

Size: Very small, typically 1 to 2 mm in length.

Booklouse (or Psocid)

Natural Habitat

Typically found in areas with high humidity or dampness. They frequent libraries, stored grains (like rice or flour), wallpaper paste, and moldy areas. They are common indoors.

Diet & Feeding

They feed on mold, fungi, starches, glue (such as book bindings), grain products, and organic detritus.

Behavior Patterns

They are wingless (often) and move in a quick, jerky manner rather than walking smoothly. They prefer dark, undisturbed, and humid environments where mold can grow. They do not bite.

Risks & Benefits

Risks: They are nuisance pests that can contaminate stored food products and damage books or wallpaper by eating the glue. Benefits: They serve as biological indicators of excessive moisture or mold issues in a home.

Identified on: 3/1/2026